package cn.itcast.demo;

import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.annotation.Order;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.stereotype.Component;
import org.springframework.util.MultiValueMap;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;
@Order(-1)  //顺序注入 ,判断谁先注入
@Component //注入到容器中
public class AuthorizeFilter  implements GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        //1. 获取请求参数
        ServerHttpRequest request = exchange.getRequest();
        MultiValueMap<String, String> params = request.getQueryParams();
        //2.获取参数中的 authorization 参数
        String authorization = params.getFirst("authorization");

        //3.判断数值是否等于admin
        if("admin".equals(authorization)){
            //4.是 —— 放行
            return chain.filter(exchange);
        }
        //5.否 —— 拦截
        //5.1 设置拦截状态码
        exchange.getResponse().setStatusCode(HttpStatus.UNAUTHORIZED);
        //5.2 设置拦截请求
        return exchange.getResponse().setComplete();
    }
}
